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    <title>Document</title>
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    <script>
        // let n = 100;

        // 二进制 ， 0b 开头
        // let n2 = 0b110;
        // console.log(n2); //6

        // 八进制， 0o开头
        // let n8 = 0o770;

        // console.log(n8); //504

    </script>
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